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<H2><B>set arrowhead</B></H2><P>
<code>set arrowhead <i>size</i></code><p>
where <code><i>size</i></code> is the size of the arrowhead. The default
is <code>0.05</code>. If set to <code>0</code>, no arrowhead is plotted.
If set to a negative value, the size of the arrowhead will be scaled to
the size of the arrow. The value specified will be the size when the arrow
is one inch  in length. <p>
<H3>Usage Note</H3><P>
<H3>Examples</H3><P>
